O g o o o



(-No Model.)

W. F. CUNNINGHAM.

SAFETY APPARATUS FOR STEAM BUILERS.

No. 404,175. Patented May 28, 1889.

N. enzns, mmwulm n hu. Washington. 04c.

UNITED STATES PATENT OFFICE.

WVILLIAM F. CUNNINGHAM, OF BROOKLYN, NEWV YORK, ASSIGNOR OF ONE HALF TO ENOOH RUTZLER, OF SAME PLACE.

SAFETY APPARATUS FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 404,175, dated May 28, 1889.

Application filed January 23, 1889. Serial No. 297,319. (No model.)

To all whom, iv Hwy concern:

Be it known that 1, WILLIAM F. CUNNING- HAM, of Brooklyn, in the county of Kings and State of New York, have invented a certain new and useful Improvement in Safety Apparatus for Steam-Boilers, of which the following is a specification.

I will describe in detail a safety apparatus for steam-boilers, and then point out the novel features in a claim.

The accompanying drawing illustrates an elevation of a safety apparatus for a steamboiler embodying my improvement.

A designates a boiler, here shown as tubular, but which may be of any desired kind.

B designates a tank for water. This tank I have shown as arranged upon the roof of a building; but it may be arranged in any position which is at a suitable height above the boiler.

O designates a pipe, shown as communicating near one end with the boiler near the upper portion of the latter, and having its other end opening into the tankB above the latter.

D designates another pipe, shown as communicating at itslower end with the boiler A near the bottom of the latter and opening at its other end into the tank B upon the under side of said tank. It will be observed that the upper end of the pipe O is wholly open to the atmosphere.

So long as the water-level in the boiler A is above the lower end of the pipe 0 the pressure will cause the water to be raised in said pipe to a height depending upon the pressure within the boiler. WVhen the water-level within the boiler sinks below the lower end of the pipe 0, the steam in the boiler will blow the column of water in the pipe Gout through the upper end of said pipe and into the tank D, from whence it will be returned through the pipe D into the boiler. An approximately constant level of water in the boiler will therefore be maintained. It is advantageous to have the upper end of the pipe O wholly open 5 to the atmosphere, because when the contained water in the pipe 0 is blown out by the steam from the boiler steam-pressure on the boiler is instantly relieved, thereby permitting a free refiow of the water from the tank B through the pipe D. I have shown a check-valve, a, in the pipe D.

IVhat I claim as my invention, and desire to secure by Letters Patent, is

The combination, with a boiler, of a standpipe in communication with the boiler at one of its ends at a point approximating the water-level of the boiler, and opening at its other end into an elevated tank, said open upper end of the pipe being in free communication with the atmosphere, and another pipe separated from the pipe first named communicating with said tank and also with the boiler at a distance below the water-level of the water, substantially as specified.

WVILLIAM F. CUNNINGHAM.-

Witnesses:

HENRY T. BROWN, FREDK. HAYNES. 

